there may use enable pin to control dmic start and stop,
so add this property in dt-bindings.

Signed-off-by: Lin Huang <h...@rock-chips.com>
---
 Documentation/devicetree/bindings/sound/dmic.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/dmic.txt 
b/Documentation/devicetree/bindings/sound/dmic.txt
index a0c58f2..54c8ef6 100644
--- a/Documentation/devicetree/bindings/sound/dmic.txt
+++ b/Documentation/devicetree/bindings/sound/dmic.txt
@@ -5,8 +5,12 @@ This device support generic PDM digital microphone.
 Required properties:
        - compatible: should be "dmic-codec".
 
+Optional properties:
+       - dmicen-gpios: GPIO specifier for dmic to control start and stop
+
 Example node:
 
        dmic_codec: dmic@0 {
                compatible = "dmic-codec";
+               dmicen-gpios = <&gpio4 3 GPIO_ACTIVE_HIGH>;
        };
-- 
2.7.4

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